The challenge for this year's show was to come up with a design for "a 1,000lb [453.6kg], four-passenger vehicle that is both comfortable and safe, while delivering satisfactory driving performance without sacrificing the styling consumers' demand." Entries are being judged not only for meeting the weight constraint (no more than 1,500 pounds/680 kg with passengers), but also for artistic beauty, comfort, uniqueness of design, roadworthiness, sustainability, performance and user-friendliness. The winner will be announced at the show, on Nov. 18. Here's a look at some of the higher-profile entries...

This 2+2 coupe features a polyhedral, 3D lattice, mono-formed frame with a flexible pressurized polymer skin, which optimizes light weight, aerodynamics and safety. It would have a range of 1,000 miles (1,609 km), running on alternative fuel.